Liquid crystal composition with good frequency dependence and liquid crystal display element

Abstract

The present invention belongs to the technical field of liquid crystal materials, and in particular relates to a liquid crystal composition with good frequency dependence and a liquid crystal display element or liquid crystal display containing the liquid crystal composition. The liquid crystal composition of the present invention comprises a compound represented by Formula I, a compound represented by Formula II and a compound represented by Formula III, wherein the mass percentage content of the compound represented by Formula I is not less than 30%. The liquid crystal composition provided by the present invention has an appropriate optical anisotropy, an appropriate dielectric anisotropy, especially a relatively low rotational viscosity, a good low-temperature mutual solubility and a good reliability, especially good frequency dependence.

The invention claimed is: 
     
       1. A liquid crystal composition with good frequency dependence, comprising a compound represented by Formula I, wherein the mass percentage content of the compound represented by Formula I in the liquid crystal composition is not less than 30%; and the liquid crystal composition further comprises one or more compounds represented by Formula II and one or more compounds represented by Formula III-A, III-B, and at least three compounds represented by Formula IV, 
       
         
           
           
               
               
           
         
         wherein in Formula II, 
         R 1  and R 2  each independently represent an alkoxy with a carbon atom number of 1-10 or an alkenoxy with a carbon atom number of 2-10; and when R 1  and R 2  each independently represent an alkoxy with a carbon atom number of 2-10 or an alkenoxy with a carbon atom number of 2-10, any one of the hydrogen atoms thereof can be replaced by F; and 
         in Formula IV, 
         R 4  represents an alkyl with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10; 
         R 4 ′ represents an alkyl with a carbon atom number of 1-10 or an alkoxy with a carbon atom number of 1-10; and 
       
       
         
           
           
               
               
           
         
       
       represents 
       
         
           
           
               
               
           
         
         the mass content of the compound represented by Formula II is 3-15%; and the mass percentage content of the compound represented by Formula III-A, III-B is 2-10%. 
       
     
     
       2. The liquid crystal composition according to  claim 1 , wherein the liquid crystal composition comprises one or more compounds represented by Formula V: 
       
         
           
           
               
               
           
         
         wherein in Formula V, 
         R 5  represents an alkyl with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10; 
         R 5 ′ represents an alkyl with a carbon atom number of 1-10 or an alkoxy with a carbon atom number of 1-10; and 
       
       
         
           
           
               
               
           
         
       
       represents 
       
         
           
           
               
               
           
         
       
       and
 Z 1  represents a single bond, —CH 2 O— or —CH 2 CH 2 —. 
 
     
     
       3. The liquid crystal composition according to  claim 1 , wherein the compound represented by Formula II in the liquid crystal composition is selected from the group consisting of compounds represented by Formulas II-A, II-B, II-C, II-D, II-E, II-F, II-G, II-H, and II-I: 
       
         
           
           
               
               
           
         
       
     
     
       4. The liquid crystal composition according to  claim 1 , wherein the liquid crystal composition further comprises one or more compounds represented by Formula IV other than those represented by Formula I: 
       
         
           
           
               
               
           
         
         wherein in Formula VI, 
         R 6  and R 6 ′ each independently represent an alkyl with a carbon atom number of 1-10, an alkoxy with a carbon atom number of 1-10 or an alkenyl with a carbon atom number of 2-10; 
       
       
         
           
           
               
               
           
         
       
       represents 
       
         
           
           
               
               
           
         
       
       and
 n represents 1 or 2 or 3; and when n represents 2 or 3, two or three 
 
       
         
           
           
               
               
           
         
          may be the same or different. 
       
     
     
       5. The liquid crystal composition according to  claim 1 , wherein the liquid crystal composition further comprises one or more compounds represented by Formula VII and/or one or more compounds represented by Formula VIII: 
       
         
           
           
               
               
           
         
         wherein 
         R 7 , R 7 ′, R 8  and R 8 ′ each independently represent an alkyl with a carbon atom number of 1-10 and an alkoxy with a carbon atom number of 1-10; and 
         X 1  and X 2  each independently represent H or F. 
       
     
     
       6. A liquid crystal display element or a liquid crystal display, characterized by comprising the liquid crystal composition according to  claim 1 , wherein the liquid crystal display element or liquid crystal display is an active matrix addressing display element or display or a passive matrix addressing display element or display.